Improvement in double-tbees



M. V; B WILLIAMSON.

Doubletree.

Patented Feb. 11, 1868.

v N ni vm M. v. B. WILLIAMSON, OF JAMESPORT, NEW; Y

LettersPatcnt'No. 74,471, dated February 11, 1868.

IMPROVEMENT Innocent-Teens. L

fill fittrtnle rtfemrm is their sins Went submitting hurt ut the sum.

To ALL WHOM I MAY concerts:

Be it known that I, M. V. B. WILILIAMS QN, of Jamesport, in the countyofSufiolk, and State of New York,

have invented certain Improvements in Double-Trees and Ida hereby declare that the following is a full and exact description thereof, reference being bad to the accompanying drawings, andtothe letters of reference marked thereon. i

Myinvention consists of the combination with a double-tree of a short single-tree or centre-bar, said double,-

tree being so constructed as to receive the outside tugs, and said single-tree being so constructed as to receive the inside tugs, and also in attaching the said single-tree to the said double-tree by means of aclevis, the' said single-tree being capable'of swinging on the bolt or'rod, by which it is attached to. said clevis, and'the forward end of the said clevis bcingcapable of swinging to the right or left, so as to approach or recede from either of the ends of the double-tree, in order to preserve anequal strain on each of the traces'of ceich horse, and to secure a directand steady draught from the centre of the double-tree. V I The object sought to be gained is to dispense with the cumbersome, expensive, and inelegant gearing which is, now used, consisting of a double-tree and single-trees combined, and at the. same time to secure a direct, steady, and equalized strainon the traces in the act er drawing the vehicle or other article to which the horses are attached. In the accompanying drawings Figure 1 is a. top view of a double-tree, embodying with its attachments my invention Figure 2 is a front view of the same. I I I I A is the double-tree, which is made long enough .toallow the outside traces to be hitched to its ends. B is the centre-bar, to which the inside traces are attached. .C is the clevis, attached to the double-tree A by the bolt D.- The centre-bar is secured to the said cleris by means of the bolt or rod E, which passes through the clevis and through the said centre-bar. a a are thick washers 'or rings, which hold the centre-bar B in its place,

in the middle, between the ends of the clevis, and keep it steady. The clevis C may be extended back, and

provided with a. hook or link, to hook on to cars or other objects which are unprovideduvith tongues or poles. The position which the parts assume when one or both horses move or draw to one side, as in turning, is shown in red lines in fig. 1. Whenon' horse draws ahead bf the other, the centre-bar B turns on its centre, and the corresponding end of the double-tree advances, preserving the equality and directness of the strain on each of the four traces, thus making the pressure come equally hard on each side of the collar, and preventing chafing.

Anotlier advantagewhich this inventionpossesses over those now in general use is, that it is izery still in its operation, andis never liable to-catch and chafe upon itself in its movements.

I claim the combination with'a double-tree, A, of a short single-tree or centre-bar,.B, capable of swinging on its centre, and attached to thedouble-tree by means of a olevis, or its equivalent, substantially as and for the purpose set forth. r

I also claim the combination of the double-tree A with the single-tree B, substantially as set forth.

M. V. B. WILLIAMSON.

Witnesses:

R. H. SEATON, H. Jmss Wssrozn. 

